PSLE The airmail rates to two countries are shown. Shiyun sent a letter weighing 62g to Thailand and a letter weighing 21g to Canada by airmail. How much did she pay altogether?
Mass |
Thailand |
Canada |
First 30g |
$0.55 |
$1.10 |
Every additional 15g |
$0.25 |
$0.45 |
Mass of the letter to Thailand excluding the first 30 g
= 62 - 30
= 32 g
Sets of additional 15 g of the letter to Thailand
= 32 ÷ 15
= 2 r 2
Sets of additional 15 g and part thereof the letter to Thailand
= 2 + 1
= 3
Amount that Shiyun paid for the letter to Thailand
= 0.55 + 3 x 0.25
= 0.55 + 0.75
= $1.30
Amount that Shiyun paid altogether
= 1.30 + 1.10
= $2.40
Answer(s): $2.40